﻿#region The MIT License
// The MIT License
// 
// Copyright (c) 2009 octalforty studios
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion

using System;
using System.IO;
using System.Linq;

namespace octalforty.Chinchillin.Shared.Deployment.Resources.Impl
{
    public class FileSystemResourceProvider : IResourceProvider
    {
        public IFileSystemManager FileSystemManager
        { get; set; }

        public IChecksumProvider ChecksumProvider
        { get; set; }

        public byte[] GetResourceChecksum(Uri resourceUri)
        {
            var path = resourceUri.LocalPath;

            if(Directory.Exists(path))
                return new byte[] { };

            if(!FileSystemManager.FileExists(path))
                throw new FileNotFoundException(string.Format("Cannot find file '{0}'.", path), path);

            using(var stream = FileSystemManager.OpenFile(path))
            {
                using(var bufferedStream = new BufferedStream(stream, 1024 * 1024 * 5))
                {
                    var checksum = ChecksumProvider.GetChecksum(bufferedStream);
                    return checksum;
                } // using
            } // using
        }

        public Stream GetResourceStream(Uri resourceUri)
        {
            return FileSystemManager.OpenFile(resourceUri.LocalPath);
        }

        public Uri[] GetResourcesHierarchy(Uri baseResourceUri)
        {
            var path = baseResourceUri.LocalPath;
            var resourcesHierarchy = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories).Select(x => new Uri("local:///" + x)).ToArray();

            return resourcesHierarchy;
        }
    }
}
